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(a) SEM image of the Ag-NP layer. (b) The extinction spectrum of Ag NPs coated on MgO film (black solid line) and a typical PL spectrum of ZnO film (red dashed line); its inset is a transmission spectrum of the Ag/MgO layer in the wavelength range of 300-600 nm. (c) RT PL spectra of Ag/MgO/ZnO multilayer films with different spacer-layer thicknesses; the inset shows the variation of enhancement ratio of integrated UV/visible emission intensity with the MgO spacer-layer thickness. (d) The dependence of PL enhancement ratio on emission wavelength.
(a) Schematic diagram of the LSP-enhanced LED structure. (b) I-V curves of the LEDs with (blue line) and without (red line) Ag/MgO interlayer; the linear I-V characteristics in the inset verify the good ohmic contact between Ni/Au (In) and p-GaN (n-ZnO).
(a) RT EL spectra of the LEDs with (blue line) and without (red line) Ag/MgO interlayer obtained at the injection current of 1 mA; the inset shows Gaussian deconvolution analysis of near-UV EL spectrum. (b) and (d) Integrated EL intensity and EL enhancement ratio of the two LEDs as a function of the injection current. (c) The dependence of EL enhancement ratio on emission wavelength, the injection current is fixed at 1 mA.
(a) 20 K TR-PL spectra of ZnO films with (blue circle) and without (red square) Ag/MgO layer monitored at 380 nm, the solid lines are the fit to a biexponential decay model. (b) Arrhenius plots of the normalized integrated UV-PL intensity of ZnO films with (blue circle) and without (red square) Ag/MgO layer.
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